Erratum to: A systematic review of risk and protective factors associated with nonmedical use of prescription drugs among youth in the United States: a social ecological perspective
1 Department of Psychiatry, Harvard Medical School/Massachusetts General Hospital, Boston, Massachusetts.
2 Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, Massachusetts.
3 Department of Public Health and Community Medicine, Tufts University School of Medicine, Boston, Massachusetts, Department of Social and Behavioral Sciences, Harvard School of Public Health, Boston, Massachusetts.